I have a 2006 Chevy Malibu on which I am installing a tow bar and plan to "flat tow" behind my Monaco Diplomat. The 2005, 2006 and 2007 models have no restrictions on speed or distance. Previous and later models are restricted to a max of 65 MPH. Why? Did they change the transmission for 3 years or forget to put the restriction in place for 3 years or what? Can I tow my Malibu at 70 or 75 MPH or not?